Mathematical quantities having both magnitude and direction; in biology, organisms that transmit disease between hosts.
From Latin vector meaning 'carrier,' from vehere 'to carry.' Originally used in mathematics in the 19th century by William Hamilton, then adopted in biology and physics to describe anything that carries or transmits.
The word 'vector' beautifully illustrates how scientific terminology evolves - from simply meaning 'carrier' in Latin, it became a precise mathematical concept, then expanded to describe disease transmission, computer graphics, and even business strategy directions.
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